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Remove Betaflight Notch Filters and Use PT1 | BF 3.1.7
#1
https://oscarliang.com/filter-betaflight/

Benefits of using PT1 filter, and removing Notch filter
- Your quad would response faster and feels more "locked in" and responsive because of the shorter latency caused by additional filters
- That will give you the best results. Sharpest response, easiest tuning and literally no prop wash on good setups.

drawbacks
- more noise will get into your system and might cause oscillations and motor/ESC overheat


Steps to remove filters in Betaflight
  • set d_lowpass_type = PT1 (in the CLI) should always be done first and I think possible on every setup
  • hover your quad for 30 seconds, see if motors are hot. If they are you should revert back, If it is still fine than
  • Remove notch 1 (set Freq = 0 in the config GUI or CLI to disable Notch filter)
  • Fly for 30s and check motors temp again, still fine remove notch 2
  • Now if your setup is still clean you could even remove dterm notch, although it might not make as much difference as the previous filters

This hack requires a clean build, such as having FC soft mounted and low ESR capacitor installed in the power or ESC. If motors get hot you should stop and revert back, your build is simply too noisy to have filters disabled. 

Here is a video showing the result

Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
[-] The following 10 users Like Oscar's post:
  • hailenp, kaitylynn, Kerni_fpv, Tom BD Bad, Drone0fPrey, unseen, RENOV8R, sloscotty, ZERONEST, sirdude
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#2
Nice flying Oscar (as always). Big Grin
"Damn the torpedoes!!!  Full speed ahead!!!"
[-] The following 1 user Likes sirdude's post:
  • Oscar
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#3
really was amazing weather today! removing the filters feels sooo good, looks so creamy Thumbs Up
[-] The following 1 user Likes ZERONEST's post:
  • Oscar
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#4
Awesome flying Oscar! It amazes me that such a simple adjustment can make such a difference. Prop wash be gone!!
[-] The following 1 user Likes RENOV8R's post:
  • Oscar
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#5
I'll have to wait until I get into more soft-mounting to try but I'll keep this post in mind when I do...

Video is awesome! you inspire me to re-look at my primary flying location, the super-empty field... maybe there are ways to make the perimeter more interesting!
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
[-] The following 1 user Likes Carl.Vegas's post:
  • Oscar
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#6
Your rates are insane bruh!  Heart Cool High Five

I have been thinking I should crank mine up a bit. I am to the point where I am trying to fit in quicker moves in tighter spaces, and find myself under rotating at times.
The Obsession IS Real!
My Youtube and Instagram links
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#7
(25-May-2017, 03:05 PM)Drone0fPrey Wrote: Your rates are insane bruh!  Heart Cool High Five

I have been thinking I should crank mine up a bit. I am to the point where I am trying to fit in quicker moves in tighter spaces, and find myself under rotating at times.

It's actually a lot lowered than I used to since we have super rate Smile
also play with SetPoint Weight, it largely changes your rates and expo as well...
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#8
(25-May-2017, 04:35 PM)Oscar Wrote: It's actually a lot lowered than I used to since we have super rate Smile
also play with SetPoint Weight, it largely changes your rates and expo as well...

I will definitely. Thanks for the tip! Come to think of it I did have to play with SetPoint Weights on my micros to get them to feel right, compared to my 5".
The Obsession IS Real!
My Youtube and Instagram links
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#9
Nice flow Oscar!
Quads:  RealACC X6R ; RealACC X210 Pro, Omnifbus F3 FCs; RunCam Swift 2 & Swift 2 Rotor Riot, Emax OG Red Bottoms, Emax RS2205S 2300kv; Fatshark DOM V3 YouTube - Mr.E_fPv
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#10
(25-May-2017, 07:23 PM)rryyyaann Wrote: Nice flow Oscar!

thanks Smile  Heart
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#11
Code:
Set d_lowpass_type=PT1
returns "invalid name" for me... Any thoughts? Am I doing something wrong?
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
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#12
(02-Jul-2017, 06:33 PM)Carl.Vegas Wrote:
Code:
Set d_lowpass_type=PT1
returns "invalid name" for me... Any thoughts? Am I doing something wrong?

Type "get lowpass" and you will find the command. It is probably just a syntax error
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#13
(02-Jul-2017, 08:36 PM)oyvinla Wrote: Type "get lowpass" and you will find the command. It is probably just a syntax error

you have to at "#" before!
Code:
#Set d_lowpass_type=PT1


and oscar this looks amazing it looks like you did have a plast while flying!!
Fly deep, fast and crash - repair and then repeat! Welcome to the Game of Drones ;)
Follow me on YOUTUBE 
and Instagram https://www.instagram.com/kernifpv/

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#14
(03-Jul-2017, 10:22 AM)Kerni_fpv Wrote: you have to at "#" before!
Code:
#Set d_lowpass_type=PT1


and oscar this looks amazing it looks like you did have a plast while flying!!

Hmm, thats strange. I never use # before any CLI command
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#15
(03-Jul-2017, 10:37 AM)oyvinla Wrote: Hmm, thats strange. I never use # before any CLI command

me to but did run in same trouble and with this it worked for me dont know why maybe a bug...
Fly deep, fast and crash - repair and then repeat! Welcome to the Game of Drones ;)
Follow me on YOUTUBE 
and Instagram https://www.instagram.com/kernifpv/

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